是否可以连接字符串和wstring？

Question

我收到的消息是

Package letters;
message A
{
    message Aa
    {
        // fields
    }
    message Aaa
    {
        // fields
    }
    repeated Aa AaMessage = 1;
    repeated Aaa AaaMessage = 2;
}
message B
{
    message Bb
    {
        // fields
    }
    message Bbb
    {
        // fields
    }
    repeated Bb BbMessage = 1;
    repeated Bbb BbbMessage = 2;
}

message alphabet
{
    repeated A MessageA = 1;
    repeated B MessageB = 2;
}

我使用CPP_OUT编译了原型文件。编译和序列化消息没问题。我使用SerializeToString（）作为..

序列化了消息

letters::alphabet letterMessage;
letters::A* aMessageFields = letterMessage->add_messagea();
letters::Aa* aaMessageFields = aMessageFields->add_aamessage();

    // set some default values for all fields in message

std::string SerializedMessage;
letterMessage.SerializeToString(&SerializedMessage);

我在另一个std :: wstring中也有JSON序列化消息。我需要将这两个消息作为单个值传递，这意味着单个消息。所以我尝试连接字符串类型protobuffer序列化值和std :: wstring JSON序列化值，并将结果字符串存储在std :: string中。我尝试了很多方法。什么都行不通：（

std::string SerializedMessage;
std::wstring JSONserializedMessage;
std::string completeMessage;
completeMessage = SerializedMessage + JSONserializedMessage;
//may be this is stupid but i want something really work like this

如果我在这里弄错了，请纠正我。

先谢谢..